How do ice cores reveal Earth’s past climate?
Quick Answer
Ice cores trap ancient snow, air bubbles, dust, and chemicals that act like time capsules. Scientists can read them to reconstruct temperatures and atmospheric conditions going back hundreds of thousands of years.
The Full Story
Polar ice sheets build up layer by layer as snow falls and compresses into ice over time. By drilling deep cores from Greenland and Antarctica, researchers can extract long records of past climate. Tiny air bubbles preserve samples of ancient atmosphere, including greenhouse gases such as carbon dioxide and methane. Chemical clues in the ice, including oxygen and hydrogen isotopes, help scientists estimate past temperatures. The longest Antarctic ice cores reach back roughly 800,000 years, making them one of the most important archives of climate history.
Key Facts
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